public class Fu {
    //私有成员属性
    private int f;

    //提供构造器
    //无参构造器
    public Fu(){
        System.out.println("Parameterless constructor of parent class");
    }
    //全参构造器
    public Fu(int f){
        this.f=f;
        System.out.println("Full argument constructor of parent class");
    }
}
